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Work from the 1920s–1930s An 850‰ platinum ring featuring a rectangular, beveled onyx plate set with an old-cut cushion-cut diamond in a beaded closed setting, with the shoulders accented by rose-cut diamonds. Weight of the center diamond: approximately 1 carat. Ring size: 53. Setting dimensions: 1.6 x 1.3 cm. Gross weight: 4.8 g. (Small chips and scratches on the onyx plate).